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      Mybatis系列五之动态SQL
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        <h2 id="u6982_u8FF0"><a href="#u6982_u8FF0" class="headerlink" title="概述"></a>概述</h2><p>　　传统的使用JDBC的方法，相信大家在组合复杂的的SQL语句的时候，需要去拼接，稍不注意哪怕少了个空格，都会导致错误。Mybatis的动态SQL功能正是为了解决这种问题， 其通过 if, choose, when, otherwise, trim, where, set, foreach标签，可组合成非常灵活的SQL语句，从而提高开发人员的效率。下面就去感受Mybatis动态SQL的魅力吧：</p>
<h2 id="if"><a href="#if" class="headerlink" title="if"></a>if</h2><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">select</span> <span class="attribute">id</span>=<span class="value">"findUserById"</span> <span class="attribute">resultType</span>=<span class="value">"user"</span>&gt;</span></span><br><span class="line">       select * from user where</span><br><span class="line">       <span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"id != null"</span>&gt;</span></span><br><span class="line">           id=#&#123;id&#125;</span><br><span class="line">       <span class="tag">&lt;/<span class="title">if</span>&gt;</span></span><br><span class="line">       and deleteFlag=0;</span><br><span class="line"><span class="tag">&lt;/<span class="title">select</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>　　上面例子中，如果传入的id不为空， 那么才会SQL才拼接id = #{id}。但是此时会出现一个问题：要是传入的id为null，那么最终的SQL语句成为：select * from user where and deleteFlag=0。这语句是有问题的，这时就需要用到mybatis的 where 标签了</p>
<h2 id="where"><a href="#where" class="headerlink" title="where"></a>where</h2><p>　　将上面的例子进行简单的改造<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">select</span> <span class="attribute">id</span>=<span class="value">"findUserById"</span> <span class="attribute">resultType</span>=<span class="value">"user"</span>&gt;</span></span><br><span class="line">       select * from user where</span><br><span class="line">	<span class="tag">&lt;<span class="title">where</span>&gt;</span></span><br><span class="line">           <span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"id != null"</span>&gt;</span></span><br><span class="line">               id=#&#123;id&#125;</span><br><span class="line">           <span class="tag">&lt;/<span class="title">if</span>&gt;</span></span><br><span class="line">           and deleteFlag=0;</span><br><span class="line">	<span class="tag">&lt;/<span class="title">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">select</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　此时，mybatis对它做了处理，当它遇到AND或者OR这些，它知道怎么处理。其实我们可以通过 trim 标签去自定义这种处理规则。</p>
<h2 id="trim"><a href="#trim" class="headerlink" title="trim"></a>trim</h2><p>上面的where标签，其实用trim可以表示如下：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">trim</span> <span class="attribute">prefix</span>=<span class="value">"WHERE"</span> <span class="attribute">prefixOverrides</span>=<span class="value">"AND |OR "</span>&gt;</span></span><br><span class="line">  ... </span><br><span class="line"><span class="tag">&lt;/<span class="title">trim</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　它的意思就是： 当WHERE后紧随AND或则OR的时候，就去除AND或者OR。 除了WHERE以外， 其实还有一个比较经典的实现，那就是SET。</p>
<h2 id="set"><a href="#set" class="headerlink" title="set"></a>set</h2><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">update</span> <span class="attribute">id</span>=<span class="value">"updateUser"</span> <span class="attribute">parameterType</span>=<span class="value">"com.dy.entity.User"</span>&gt;</span></span><br><span class="line">	update user set </span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"name != null"</span>&gt;</span></span><br><span class="line">			name = #&#123;name&#125;,</span><br><span class="line">		<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"password != null"</span>&gt;</span></span><br><span class="line">			password = #&#123;password&#125;,</span><br><span class="line">		<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"age != null"</span>&gt;</span></span><br><span class="line">			age = #&#123;age&#125;</span><br><span class="line">		<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">		<span class="tag">&lt;<span class="title">where</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"id != null"</span>&gt;</span></span><br><span class="line">				id = #&#123;id&#125;</span><br><span class="line">			<span class="tag">&lt;/<span class="title">if</span>&gt;</span></span><br><span class="line">			and deleteFlag = 0;</span><br><span class="line">		<span class="tag">&lt;/<span class="title">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">update</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>　　此时，新的问题产生了：如果只有name不为null，那么这SQL就成了 update set name = #{name}, where …，name后面那逗号会导致出。这时候，就可以用mybatis为我们提供的set标签了。<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">update</span> <span class="attribute">id</span>=<span class="value">"updateUser"</span> <span class="attribute">parameterType</span>=<span class="value">"com.dy.entity.User"</span>&gt;</span></span><br><span class="line">	update user</span><br><span class="line">	<span class="tag">&lt;<span class="title">set</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"name != null"</span>&gt;</span>name = #&#123;name&#125;,<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"password != null"</span>&gt;</span>password = #&#123;password&#125;,<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"age != null"</span>&gt;</span>age = #&#123;age&#125;,<span class="tag">&lt;/<span class="title">if</span>&gt;</span> </span><br><span class="line">	<span class="tag">&lt;/<span class="title">set</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="title">where</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="title">if</span> <span class="attribute">test</span>=<span class="value">"id != null"</span>&gt;</span></span><br><span class="line">			id = #&#123;id&#125;</span><br><span class="line">		<span class="tag">&lt;/<span class="title">if</span>&gt;</span></span><br><span class="line">		and deleteFlag = 0;</span><br><span class="line">	<span class="tag">&lt;/<span class="title">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">update</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　这个用trim 可表示为：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">trim</span> <span class="attribute">prefix</span>=<span class="value">"SET"</span> <span class="attribute">suffixOverrides</span>=<span class="value">","</span>&gt;</span></span><br><span class="line">  ...</span><br><span class="line"><span class="tag">&lt;/<span class="title">trim</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　WHERE是使用的prefixOverrides（前缀），SET是使用的suffixOverrides（后缀）！</p>
<h2 id="foreach"><a href="#foreach" class="headerlink" title="foreach"></a>foreach</h2><p>　　java中有for循环，同样，mybatis中有foreach，可通过它实现循环，循环的对象当然主要是java容器和数组。</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">select</span> <span class="attribute">id</span>=<span class="value">"selectPostIn"</span> <span class="attribute">resultType</span>=<span class="value">"domain.blog.Post"</span>&gt;</span></span><br><span class="line">  SELECT *</span><br><span class="line">  FROM POST P</span><br><span class="line">  WHERE ID in</span><br><span class="line">  <span class="tag">&lt;<span class="title">foreach</span> <span class="attribute">item</span>=<span class="value">"item"</span> <span class="attribute">index</span>=<span class="value">"index"</span> <span class="attribute">collection</span>=<span class="value">"list"</span></span><br><span class="line">      <span class="attribute">open</span>=<span class="value">"("</span> <span class="attribute">separator</span>=<span class="value">","</span> <span class="attribute">close</span>=<span class="value">")"</span>&gt;</span></span><br><span class="line">        #&#123;item&#125;</span><br><span class="line">  <span class="tag">&lt;/<span class="title">foreach</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">select</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="choose"><a href="#choose" class="headerlink" title="choose"></a>choose</h2><p>　　Java中有switch,  mybatis有choose。<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">select</span> <span class="attribute">id</span>=<span class="value">"findActiveBlogLike"</span></span><br><span class="line">     <span class="attribute">resultType</span>=<span class="value">"Blog"</span>&gt;</span></span><br><span class="line">  SELECT * FROM BLOG WHERE state = ‘ACTIVE’</span><br><span class="line">  <span class="tag">&lt;<span class="title">choose</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">when</span> <span class="attribute">test</span>=<span class="value">"title != null"</span>&gt;</span></span><br><span class="line">      AND title like #&#123;title&#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="title">when</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">when</span> <span class="attribute">test</span>=<span class="value">"author != null and author.name != null"</span>&gt;</span></span><br><span class="line">      AND author_name like #&#123;author.name&#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="title">when</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">otherwise</span>&gt;</span></span><br><span class="line">      AND featured = 1</span><br><span class="line">    <span class="tag">&lt;/<span class="title">otherwise</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="title">choose</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">select</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　以上例子中： 当title和author都不为null的时候， 那么选择二选一（前者优先）， 如果都为null, 那么就选择 otherwise中的， 如果tilte和author只有一个不为null, 那么就选择不为null的那个。<br>　　本文只是根据网上资料直接移植过来，实际工作中只需要多试试就行了</p>
<h2 id="u53C2_u8003_u6587_u7AE0"><a href="#u53C2_u8003_u6587_u7AE0" class="headerlink" title="参考文章"></a>参考文章</h2><p><a href="http://www.cnblogs.com/dongying/p/4092662.html" target="_blank" rel="external">http://www.cnblogs.com/dongying/p/4092662.html</a></p>

      
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